var stdin=process.stdin;
var argvArr=process.argv;

if (argvArr[2] == undefined || argvArr[2] == "--help" || argvArr[2] == "--h" ) {
    console.log("please use  '--help' or '--h' to help you use this program");
}
else if (argvArr.length>2&&argvArr.length<=5) {
    for (let i = 2; i < argvArr.length; i++) {
        let element = argvArr[i];
        try {
            console.log(element+"="+eval(element));
        } catch (error) {
            console.log("EroMsg: "+error);
        }

    }
}
else if (argvArr.length>5) {
    for (let i = 2; i < 5; i++) {
        let element = argvArr[i];
        try {
            console.log(element+"="+eval(element));
        } catch (error) {
            console.log("EroMsg: "+error);
        }

    }
}
